FWIW, I have been overjoyed with my handy dandy enviro steamer for cleaning crud. A handy wand steamer with some brush attachments will work wonders on de greasing an engine bay, and given the small actual water usage, is a lot less messy than hosing things down. You can always pre-treat with a degreaser and then hit it with the steam to dislodge the grime. Very controllable and easy to keep away from sensitive electronics.

Just a thought

__________________
Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)